/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file           : main.c
  * @brief          : Main program body
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2024 STMicroelectronics.
  * All rights reserved.
  *
  * This software is licensed under terms that can be found in the LICENSE file
  * in the root directory of this software component.
  * If no LICENSE file comes with this software, it is provided AS-IS.
  *
  ******************************************************************************
  */
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "gpio.h"

/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include <stdbool.h>
/* USER CODE END Includes */

/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
typedef void (*keyCallbackFunc)(void);

typedef struct {
	GPIO_TypeDef *GPIOx;
	uint16_t GPIO_Pin;
	uint32_t pressedTime;
	bool maybePressedDown;
	keyCallbackFunc onRelease;
} keyContext_t;

typedef enum {
	eventPressed,
	eventReleased,
	eventNone
} keyEvent_t;
/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */

/* USER CODE END PD */

/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
#define LONG_PRESSED_DURATION    ( 3000U )
/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/

/* USER CODE BEGIN PV */
extern bool keyTickFlag;
extern bool ledTickFlag;

keyContext_t b1;
keyContext_t b2;
/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
/* USER CODE BEGIN PFP */
static void LED_toggle(GPIO_TypeDef *GPIOx, uint16_t GPIO_Pin);
static void LED_processLoop(void);

static void KEY_init(keyContext_t* context, GPIO_TypeDef *GPIOx, uint16_t GPIO_Pin, keyCallbackFunc onRelease);
static bool KEY_scan_pressed(keyContext_t* context);
static bool KEY_scan_released(keyContext_t* context);
static void KEY_processLoop(void);
static void b1OnRelease(void);
static void b2OnRelease(void);
/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */

/* USER CODE END 0 */

/**
  * @brief  The application entry point.
  * @retval int
  */
int main(void)
{
  /* USER CODE BEGIN 1 */

  /* USER CODE END 1 */

  /* MCU Configuration--------------------------------------------------------*/

  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();

  /* USER CODE BEGIN Init */

  /* USER CODE END Init */

  /* Configure the system clock */
  SystemClock_Config();

  /* USER CODE BEGIN SysInit */

  /* USER CODE END SysInit */

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  /* USER CODE BEGIN 2 */
  KEY_init(&b1, B1_GPIO_Port, B1_Pin, b1OnRelease);
	KEY_init(&b2, B2_GPIO_Port, B2_Pin, b2OnRelease);
  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
		LED_processLoop();
		KEY_processLoop();
  }
  /* USER CODE END 3 */
}

/**
  * @brief System Clock Configuration
  * @retval None
  */
void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

  /** Configure the main internal regulator output voltage
  */
  HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1);

  /** Initializes the RCC Oscillators according to the specified parameters
  * in the RCC_OscInitTypeDef structure.
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
  RCC_OscInitStruct.PLL.PLLM = RCC_PLLM_DIV3;
  RCC_OscInitStruct.PLL.PLLN = 20;
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
  RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV2;
  RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }

  /** Initializes the CPU, AHB and APB buses clocks
  */
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                              |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
  {
    Error_Handler();
  }
}

/* USER CODE BEGIN 4 */
static void LED_toggle(GPIO_TypeDef *GPIOx, uint16_t GPIO_Pin)
{
	HAL_GPIO_TogglePin(GPIOx, GPIO_Pin);
	HAL_GPIO_WritePin(LE_GPIO_Port, LE_Pin, GPIO_PIN_SET);
	HAL_GPIO_WritePin(LE_GPIO_Port, LE_Pin, GPIO_PIN_RESET);
}

static void LED_processLoop()
{
	if(ledTickFlag)
	{
		ledTickFlag = false;
		LED_toggle(LD8_GPIO_Port, LD8_Pin);
	}
}

static void KEY_init(keyContext_t* context, GPIO_TypeDef *GPIOx, uint16_t GPIO_Pin, keyCallbackFunc onRelease)
{
	context->GPIOx = GPIOx;
	context->GPIO_Pin = GPIO_Pin;
	context->maybePressedDown = false;
	context->onRelease = onRelease;
}

static void KEY_processLoop()
{
	if(keyTickFlag)
	{
		keyTickFlag = false;
		
		if(KEY_scan_pressed(&b1))
			b1.onRelease();
		
		if(KEY_scan_released(&b2))
			b2.onRelease();
	}
}

static bool KEY_scan_pressed(keyContext_t* context)
{
	bool rst = false;
	uint32_t currentTick = HAL_GetTick();
	
	if(HAL_GPIO_ReadPin(context->GPIOx, context->GPIO_Pin) == GPIO_PIN_SET)
	{
		context->maybePressedDown = false;
		context->pressedTime = 0xFFFFFFFF;
	}
	
	if(context->maybePressedDown)
	{
		if(HAL_GPIO_ReadPin(context->GPIOx, context->GPIO_Pin) == GPIO_PIN_RESET 
			&& currentTick - context->pressedTime > LONG_PRESSED_DURATION)
		{
			context->maybePressedDown = false;
			context->pressedTime = 0xFFFFFFFF;
			rst = true;
		}
	}
	else
	{
		if(HAL_GPIO_ReadPin(context->GPIOx, context->GPIO_Pin) == GPIO_PIN_RESET)
		{
			context->maybePressedDown = true;
			context->pressedTime = HAL_GetTick();
		}
	}

	return rst;
}

static bool KEY_scan_released(keyContext_t* context)
{
	bool rst = false;
	uint32_t currentTick = HAL_GetTick();
	
	if(context->maybePressedDown)
	{
		if(HAL_GPIO_ReadPin(context->GPIOx, context->GPIO_Pin) == GPIO_PIN_SET)
		{
			if(currentTick - context->pressedTime > LONG_PRESSED_DURATION)
			{
				rst = true;
			}
			
			context->maybePressedDown = false;
			context->pressedTime = 0xFFFFFFFF;
		}
	}
	else
	{
		if(HAL_GPIO_ReadPin(context->GPIOx, context->GPIO_Pin) == GPIO_PIN_RESET)
		{
			context->maybePressedDown = true;
			context->pressedTime = HAL_GetTick();
		}
	}

	return rst;
}

static void b1OnRelease()
{
			LED_toggle(LD1_GPIO_Port, LD1_Pin);
}

static void b2OnRelease()
{
	
			LED_toggle(LD2_GPIO_Port, LD2_Pin);
}
/* USER CODE END 4 */

/**
  * @brief  This function is executed in case of error occurrence.
  * @retval None
  */
void Error_Handler(void)
{
  /* USER CODE BEGIN Error_Handler_Debug */
  /* User can add his own implementation to report the HAL error return state */
  __disable_irq();
  while (1)
  {
  }
  /* USER CODE END Error_Handler_Debug */
}

#ifdef  USE_FULL_ASSERT
/**
  * @brief  Reports the name of the source file and the source line number
  *         where the assert_param error has occurred.
  * @param  file: pointer to the source file name
  * @param  line: assert_param error line source number
  * @retval None
  */
void assert_failed(uint8_t *file, uint32_t line)
{
  /* USER CODE BEGIN 6 */
  /* User can add his own implementation to report the file name and line number,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
  /* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */
